code: def brute_force(f, dy, dx):
      res = np.zeros((f.max() + 1, f.max() + 1), np.double)
      for y in range(f.shape[0]):
          for x in range(f.shape[1]):
              if 0 <= y + dy < f.shape[0] and 0 <= x + dx < f.shape[1]:
                  res[f[y, x], f[y + dy, x + dx]] += 1
      return res
  
imports: import numpy
  from mahotas.features import texture
  import mahotas
  import mahotas.features._texture
  import pytest
label_desc: Use image node_id 3 for calling a global function with example usage: brute_force(f, dy, dx) and returns: res